Revert "drm/amd/display: New path for enabling DPG"

This reverts commit f8e792dc

[Why]
We are not implementing the planned new HW
sequence for HUBP disable.

[How]
Revert most related changes to minimize regressions.
Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Reviewed-by: Martin Leung <Martin.Leung@amd.com>
Acked-by: Qingqing Zhuo <Qingqing.Zhuo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -2284,8 +2284,6 @@ static void copy_stream_update_to_stream(struct dc *dc,
 	if (update->dither_option)
 		stream->dither_option = *update->dither_option;
 
-	if (update->pending_test_pattern)
-		stream->test_pattern = *update->pending_test_pattern;
 	/* update current stream with writeback info */
 	if (update->wb_update) {
 		int i;
@@ -2382,15 +2380,6 @@ static void commit_planes_do_stream_update(struct dc *dc,
 				}
 			}
 
-			if (stream_update->pending_test_pattern) {
-				dc_link_dp_set_test_pattern(stream->link,
-					stream->test_pattern.type,
-					stream->test_pattern.color_space,
-					stream->test_pattern.p_link_settings,
-					stream->test_pattern.p_custom_pattern,
-					stream->test_pattern.cust_pattern_size);
-			}
-
 			/* Full fe update*/
 			if (update_type == UPDATE_TYPE_FAST)
 				continue;

drivers/gpu/drm/amd/display/dc/dc_stream.h

@@ -130,14 +130,6 @@ union stream_update_flags {
 	uint32_t raw;
 };
 
-struct test_pattern {
-	enum dp_test_pattern type;
-	enum dp_test_pattern_color_space color_space;
-	struct link_training_settings const *p_link_settings;
-	unsigned char const *p_custom_pattern;
-	unsigned int cust_pattern_size;
-};
-
 struct dc_stream_state {
 	// sink is deprecated, new code should not reference
 	// this pointer
@@ -235,8 +227,6 @@ struct dc_stream_state {
 
 	uint32_t stream_id;
 	bool is_dsc_enabled;
-
-	struct test_pattern test_pattern;
 	union stream_update_flags update_flags;
 };
 
@@ -271,7 +261,6 @@ struct dc_stream_update {
 	struct dc_dsc_config *dsc_config;
 	struct dc_transfer_func *func_shaper;
 	struct dc_3dlut *lut3d_func;
-	struct test_pattern *pending_test_pattern;
 };
 
 bool dc_is_stream_unchanged(